Use of var keyword in C#

Answer 1

Neither of those is absolutely true; var can have both positive and negative effects on readability. In my opinion, var should be used when either of the following is true:

1. The type is anonymous (well, you don't have any choice here, as it must be var in this case)
2. The type is obvious based upon the assigned expression (i.e. var foo = new TypeWithAReallyLongNameTheresNoSenseRepeating())

var has no performance impacts, as it's syntactic sugar; the compiler infers the type and defines it once it's compiled into IL; there's nothing actually dynamic about it.